Age is a risk factor for breast cancer among both women and men. The older you are, the more likely you are to get breast cancer. Less than five percent of women diagnosed with breast cancer in the USA are younger than 40. About half of women with breast cancer will be diagnosed after age 60. While the incidence of breast cancers driven by estrogen increases with age, the incidence of estrogen receptor-negative breast cancer increases until age 50, then levels off.... Read More